CN109490406B - Dynamic magnetic detection system, detection method and electromagnetic array control method - Google Patents
Dynamic magnetic detection system, detection method and electromagnetic array control method Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
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Abstract
The invention provides a dynamic magnetic detection system, a detection method and an electromagnetic array control method, wherein the system comprises: a magnetic field applying device for applying a magnetic field to an object to be measured having ferromagnetism; the dynamic magnetic excitation device is used for generating a transient excitation magnetic field; and the magnetic field detection device is used for detecting the induced magnetic signals around the object to be detected. The dynamic magnetic detection system and the method provided by the invention can detect the defect with smaller scale and higher precision, and the detection performance is kept stable under high-speed movement.
Description
Technical Field
The invention relates to the technical field of electronic information, in particular to a dynamic magnetic detection system, a detection method and an electromagnetic array control method.
Background
The oil gas pipeline defect internal detection technology and the equipment have great industrial and practical significance.
Magnetic flux leakage detection is a pipeline defect internal detection technology which is formed at home and abroad at present. The magnetic leakage detection technology is based on a pipe wall of a constant magnetic field magnetization detection area provided by a permanent magnet, measures a magnetic leakage signal generated by pipe wall defects through magnetic field sensing elements such as a Hall sensor and the like, and identifies the pipe defect information according to the characteristics of the magnetic leakage signal.
The magnetic flux leakage detection generally can only detect defects with large scales such as corrosion, but has poor detection accuracy for defects with small scales such as cracks.
Disclosure of Invention
In view of the above, it is necessary to provide a dynamic magnetic detection system, a detection method and an electromagnetic array control method with high precision for detecting defects with small dimensions, wherein the system includes:
a magnetic field applying device for applying a magnetic field to an object to be measured having ferromagnetism;
the dynamic magnetic excitation device is used for generating a transient excitation magnetic field;
and the magnetic field detection device is used for detecting the induced magnetic signals around the object to be detected.
In one embodiment, the magnetic field applying means comprises a permanent magnet or an electromagnet.
In one embodiment, the moving magnetic excitation means comprises a moving magnetic excitation coil.
In one embodiment, the dynamic magnetic detection system further comprises a high-frequency pulse current generation device electrically connected with the dynamic magnetic excitation device.
In one embodiment, the high-frequency pulse current generating device comprises a metal oxide semiconductor field effect transistor for generating pulse current, and the pulse width of the pulse excitation current is 1-5 mus, and the rising edge and the falling edge are respectively 0.05-0.2 mus.
In one embodiment, the magnetic field detection device comprises a receiving coil, the receiving coil is a differential receiving coil, the differential receiving coil comprises a first receiving coil and a second receiving coil, the first receiving coil and the second receiving coil are wound in opposite directions, and the first receiving coil and the second receiving coil are connected end to end.
In one embodiment, the dynamic magnetic detection system further comprises a hilbert transformer connected to the magnetic field detection device for hilbert varying the magnetic signal.
In one embodiment, the dynamic magnetic detection system further comprises:
a first low noise amplifier provided between the Hilbert transformer and the magnetic field detection device;
the second low-noise amplifier is connected to the signal output end of the Hilbert converter;
a low pass filter disposed between the Hilbert transformer and the second low noise amplifier.
In one embodiment, the dynamic magnetic detection system further comprises a magnetic leakage detection device, the magnetic leakage detection device is a multi-channel hall chip array, and each channel comprises X, Y, Z hall chips in three perpendicular directions of the axis and is used for detecting spatial magnetic leakage signals.
In one embodiment, the dynamic magnetic detection system further comprises:
and a control device for controlling the magnetic field applying device, the moving magnetic excitation device, the magnetic field detecting device, the magnetic flux leakage detecting device, and the Hilbert transformer.
The invention also provides a dynamic magnetic detection method, which comprises the following steps:
applying a magnetic field to an object to be detected to enable the object to be detected to enter a magnetic saturation state;
applying a transient excitation magnetic field to the object to be tested;
and after the transient excitation magnetic field is superposed, detecting magnetic signals around the detected object.
In one embodiment, the step of detecting the magnetic signal around the probe after superimposing the transient excitation magnetic field further includes:
performing Hilbert transform on the magnetic signal through a Hilbert transformer and outputting a waveform signal;
and judging whether the object to be detected has defects or not according to the waveform signal.
In one embodiment, further comprising: and acquiring a three-dimensional space magnetic field signal through a magnetic flux leakage detection device, and analyzing the three-dimensional space magnetic signal to acquire the defect condition.
In one embodiment, the transient excitation magnetic field is generated by a moving magnetic excitation device, the moving magnetic excitation device is connected with the high-frequency pulse current generation device, and pulse excitation currents with the pulse width of 1-5 mus and the rising edge and the falling edge of 0.05-0.2 mus respectively are input into the moving magnetic excitation device to generate the transient excitation magnetic field.
The invention also provides an electromagnetic array control method, which comprises the following steps:
providing a plurality of dynamic magnetic detection systems of any one of the preceding claims;
and controlling the dynamic magnetic detection system by a control system and a sequential control method through a sequential control array.
According to the dynamic magnetic detection system provided by the invention, the magnetic field applying device applies a magnetic field to the object to be detected with ferromagnetism to enable the object to be detected to enter a magnetic saturation state, the dynamic magnetic excitation device generates a transient excitation magnetic field on the surface of the object to be detected, and the magnetic field detection device detects the induced magnetic signal at the position of the magnetic field detection device. And if the object to be detected has a small-scale defect, comparing the detected magnetic signal with the magnetic signal without the defect to give defect information. The invention can detect the defect with smaller scale and has higher precision.
Drawings
FIG. 1 is a schematic diagram of a magnetic field detection system according to an embodiment;
FIG. 2 is a block diagram of the processing of moving magnetic signals of the magnetic field sensing system of one embodiment;
FIG. 3 is a schematic structural diagram of a magnetic field detection system according to another embodiment;
FIG. 4 is a flow diagram of a dynamic magnetic detection method of a dynamic magnetic detection system of an embodiment;
FIG. 5 is a B-H curve evolution diagram of the object to be measured when the magnetic field applying device applies the magnetic field;
FIG. 6 is a magnetic field distribution diagram of a defect on the outer surface of the DUT;
FIG. 7 is a magnetic field distribution diagram of a defect on the inner surface of the DUT;
FIG. 8 is measured voltage data for a defect on the inner surface of a material;
FIG. 9 is measured voltage data for a defect on an outer surface of a material;
FIG. 10 is the evolution of moving magnetic signal voltage at different moving speeds;
FIG. 11 is a schematic diagram of a sequential control array of an electromagnetic array control method according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for illustrating the technical solutions of the present invention, and are not used for limiting the technical solutions of the present invention.
Referring to fig. 1, a magnetic field detection system 10 according to an embodiment of the present invention includes: a magnetic field applying device 100, a moving magnetic excitation device 200 and a magnetic field detecting device 300. The magnetic field applying apparatus 100 is used to apply a magnetic field to an object 900 to be measured having ferromagnetism. The moving magnetic excitation device 200 is used for generating a transient excitation magnetic field. The magnetic field detection device 300 is used for detecting the induced magnetic signal of the position of the magnetic field detection device 300.
The magnetic field applying apparatus 100 applies a magnetic field to the object 900 to be measured having ferromagnetism, so that the object 900 to be measured reaches a magnetic saturation state, and a constant magnetic field is provided around the object to be measured. The moving magnetic excitation device 200 is arranged on the surface of the object 900 to be measured, and generates a transient excitation magnetic field with a direction perpendicular to the constant magnetic field and a magnetic field intensity much smaller than that of the constant magnetic field. The magnetic field detection device 300 detects the dynamic magnetic response induced by the transient excitation magnetic field to obtain the magnetic signal of the position of the magnetic field detection device 300. The magnetic signals comprise an earth magnetic field signal, a magnetic field applying device, a magnetic signal induced by a moving magnetic excitation device and the like. The magnetic field detecting device 300 may be an existing magnetic field measuring instrument, or may be one conductive coil or a plurality of conductive coils, etc.
In one embodiment, the moving magnetic excitation device 200 and the magnetic field detection device 300 may be integrated together and movably disposed together near the object 900 to be measured on which the magnetic field applying device 100 is disposed.
In the dynamic magnetic detection system 10 provided by the present invention, the magnetic field applying device 100 applies a magnetic field to the object to be detected having ferromagnetism to make the object to be detected enter a magnetic saturation state, the moving magnetic excitation device 200 generates a transient excitation magnetic field on the surface of the object to be detected, and the magnetic field detecting device 300 detects a magnetic signal at the position of the magnetic field detecting device 300. The defect of the object to be detected with smaller scale can be represented by the change of the detected magnetic signal. The invention can detect the defect with smaller scale and has higher precision.
In one embodiment, the magnetic field applying device 100 is a permanent magnet or an electromagnet. The magnetic field applying apparatus 100 may be other devices for magnetizing the object to be measured.
In one embodiment, the moving magnet excitation device 200 is a moving magnet excitation coil.
In one embodiment, the magnetic field detection system 10 further includes a high-frequency pulse current generating device 210 electrically connected to the moving magnetic excitation device, for supplying a current to the moving magnetic excitation device to enable the moving magnetic excitation device to generate an induced transient magnetic field. The moving magnet exciting device can also be connected with variable current generated by other equipment, such as alternating current. In one embodiment, the high frequency pulse current generating device 210 comprises a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) for generating a pulse current having a pulse width of 1-5 μ s and a rising edge and a falling edge of 0.05-0.2 μ s, respectively. Preferably, the pulse excitation current with the pulse width of 1-5 mus and the rising and falling edges of 0.05-0.2 mus is generated by controlling the switch of the metal oxide semiconductor field effect transistor. In one embodiment, the switch of the metal oxide semiconductor field effect transistor is controlled by a program in real time. When the magnetic field detection is carried out at the falling edge of the pulse current, the signal-to-noise ratio of the obtained magnetic signal is high.
Referring to fig. 2, in an embodiment, the magnetic field detection device 300 is a receiving coil, the receiving coil is a differential receiving coil, the differential receiving coil includes a first receiving coil 310 and a second receiving coil 320, the first receiving coil 310 and the second receiving coil 320 are wound in opposite directions, and the first receiving coil 310 and the second receiving coil 320 are connected end to end. The coil designed by the mode can effectively eliminate interference magnetic signals and improve the signal-to-noise ratio of the moving magnetic signals.
In one embodiment, the magnetic field detection system 10 further comprises the hilbert transformer 400 connected to the magnetic field detection device 300 for hilbert varying the magnetic signal.
Specifically, the magnetic field detection device 300 receives the transient excitation magnetic field generated by the moving magnetic excitation device 200. The hilbert transformer 400 receives the magnetic signal output from the magnetic field detection device 300, and outputs the magnetic signal after hilbert conversion. The hilbert transformer 400 has the functions of improving the signal-to-noise ratio of the magnetic signal output by the magnetic field detection device 300, prolonging the observation time of the magnetic signal, and converting analog information.
In one embodiment, the magnetic field detection system 10 further comprises: a first low noise amplifier 510, a second low noise amplifier 520, and a low pass filter 530. The first low noise amplifier 510 is disposed between the hilbert transformer 400 and the magnetic field detection device 300. The second low noise amplifier 520 is connected to the signal output terminal of the hilbert transformer 400. The low pass filter 530 is disposed between the hilbert transformer 400 and the second low noise amplifier 520. By using the first low noise amplifier 510, the second low noise amplifier 520 and the low pass filter 530, the final output signal is more accurate.
Referring to fig. 3, in an embodiment, the magnetic field detection system 10 further includes a magnetic leakage detection device 600, where the magnetic leakage detection device 600 is a multi-channel hall chip array, and each channel includes three hall chips in the direction perpendicular to the X, Y, Z axes, and is used for detecting a spatial magnetic leakage signal. During the use, will magnetic leakage detection device 600 sets up inside the determinand. After the magnetic flux leakage detection is fused, the magnetic field detection system 10 can detect both large-scale defects and small-scale defects on objects to be detected, such as pipelines, and the like, so that the application range and the precision are improved.
In one embodiment, the magnetic field detection system 10 further comprises: and a control device (not shown) for controlling the magnetic field applying device 100, the moving magnetic excitation device 200, the magnetic field detecting device 300, and the magnetic flux leakage detecting device 600. In one embodiment, the control device may also control the magnetic field applying device 100, the moving magnetic excitation device 200, the magnetic field detecting device 300, the leakage magnetic flux detecting device 600, and the hilbert transformer 400 or other devices in the magnetic field detecting system 10 at the same time. In one embodiment, the control device 800 controls the magnetic leakage detecting device 600, the magnetic field applying device 100, the moving magnetic excitation device 200, and the magnetic field detecting device 300. By distributing the acquisition working time sequence, the instantaneous working current of the system is reduced, and all acquisition work is efficiently completed in a short enough time window, so that the whole dynamic magnetic detection system has high acquisition efficiency, low power consumption and good safety.
Referring to fig. 4, the present invention further provides a dynamic magnetic detection method, including:
s100, applying a magnetic field to an object to be detected to enable the object to be detected to enter a magnetic saturation state;
s200, applying a transient excitation magnetic field to the object to be tested;
and S300, after the transient excitation magnetic field is superposed, detecting magnetic signals around the detected object.
In one embodiment, the step S300 is followed by:
s400, performing Hilbert transform on the magnetic signal through a Hilbert transformer and outputting a waveform signal;
and S500, judging whether the object to be detected has defects or not according to the waveform signal.
In one embodiment, the dynamic magnetic detection method further comprises:
and S110, acquiring a three-dimensional space magnetic field signal through a magnetic flux leakage detection device, and analyzing the three-dimensional space magnetic field signal to obtain a defect condition.
In one embodiment, the dynamic magnetic detection method further comprises:
s110, generating pulse excitation currents with the pulse width of 1-5 mu S and the rising edge and the falling edge of 0.05-0.2 mu S respectively through a high-frequency pulse current generating device;
and S120, introducing the pulse excitation current into the conductive coil to generate a transient excitation magnetic field.
The magnetic field detection system 10 of the present invention has the following specific application processes:
the control device starts the magnetic field applying device 100 to apply a magnetic field to the object to be measured so that the object to be measured enters a magnetic saturation state. Then the control device controls to start the leakage magnetic detection device 600 to detect the leakage magnetic signal of the three-dimensional space. The control device controls to sequentially turn on the magnetic field applying device 100, the moving magnetic excitation device 200, the magnetic field detecting device 300, the first low noise amplifier 510, the hilbert transformer 400, the low pass filter 530, and the second low noise amplifier 520, and starts moving magnetic detection to obtain a magnetic signal.
Finally, the magnetic signal output by the second low noise amplifier 520 is analyzed, and the leakage magnetic signal is analyzed.
Referring to FIG. 5, a B-H curve evolution diagram of the DUT when the magnetic field applying device applies the magnetic field. When the ferromagnetic object to be detected is saturated and magnetized by applying a strong magnetic field, the working point of the B-H curve of the object to be detected is on a static working point Q (B, H), and the working point is in a saturation area on the B-H curve. When the externally applied magnetic field H is further increased, the magnetic induction intensity B in the object to be detected is slowly increased and enters a saturated state. At this time, a dynamic magnetic excitation B is applied in the direction perpendicular to the applied field H, and the dynamic operating point of the object to be measured moves to Q' (B + B, H + H).
Referring to fig. 6, a magnetic field distribution of defects on the outer surface of the dut is shown. When the defect is on the outer surface of the object to be measured, a transient excitation magnetic field is generated near the inner surface of the object to be measured. Because the external applied magnetic field at the edge of the material opening leaks and turns to the moving magnetic excitation direction from the original moving direction, the density of the transient excitation magnetic field at the edge of the defect opening is higher than that at the positions at two sides of the defect, as shown in fig. 6, the larger the circle is, the larger the density of the transient excitation magnetic field is.
Referring to fig. 7, a magnetic field distribution of a defect on the inner surface of the dut is shown. When a defect appears on the inner surface of the object to be measured, the magnetic permeability of the air region at the defect position is changed into the air magnetic permeability, the electric conductivity is reduced to 0, the density of the generated transient excitation magnetic field is reduced due to the fact that the distance between the depression and the transient excitation magnetic field is longer, and as shown in fig. 7, the smaller the circle is, the smaller the density of the transient excitation magnetic field is.
When the defect is on the outer surface of the object to be detected, the density of the transient excitation magnetic field at the edge and the inner part of the defect is high, and the density of the transient excitation magnetic field at the two sides of the defect is low; when the defect is on the inner surface, the defect edge and the internal transient excitation magnetic field density are small, and the transient excitation magnetic field densities on the two sides of the defect are large.
Further, the change trends of the density of the transient excitation magnetic field caused by the defects on the inner surface and the outer surface along the moving direction are just opposite, and by utilizing the characteristic, the dynamic magnetic excitation and the differential receiving are adopted, so that the defects on the inner surface and the outer surface are reliably detected in a high-speed moving state, and the functions of distinguishing the distribution (ID/OD) of the inner surface and the outer surface of the defects are realized.
Referring to fig. 8, voltage data was measured for defects on the inner surface of the material. The measured data show that when the defect is on the inner surface of the material, the output waveform of the magnetic signal along the moving direction is firstly negative envelope and then positive envelope.
Referring to fig. 9, voltage data is measured while the defect is on the outer surface of the dut. The measured data shows that when the defect is on the outer surface of the object to be detected, the waveform of the magnetic signal after differential output and Hilbert transformation is positive and then negative; further, the length interval of the positive and negative waveform peaks is very close to the length dimension of the defect, which indicates that the front and back differential receiving coils are very sensitive to the defect length edge, and also proves that the transient excitation magnetic field density at the position is greatly changed.
Referring to fig. 10, the magnetic signal voltage evolves at different moving speeds. The abscissa is the direction of movement in millimeters (mm), and the ordinate is the magnetic signal voltage in volts (V). As can be seen from fig. 10, when the moving speed actually measured by the magnetic field detection system 10 is in the range of 1-8m/s, the differential output waveforms of the same defect substantially overlap and are less affected by the moving speed. Reliable and stable detection in a high-speed moving state can be realized. And the detection performance of the magnetic field detection system 10 is stable under high-speed movement.
Referring to fig. 11, the present embodiment further provides an electromagnetic array control method, including:
s100' providing a plurality of any of the aforementioned dynamic magnetic detection systems;
and S200' controlling the dynamic magnetic detection system through a control system and a sequential control method through a sequential control array.
Specifically, each module in fig. 11 corresponds to one of the dynamic magnetic detection systems. The control module is a control system. The control module distributes a specific acquisition working time sequence to control different dynamic magnetic detection systems through a sequential control method. In one embodiment, multiple modules may be grouped. Respectively controlled by a sequential control method. The sequential control array in the electromagnetic array control method adopts a sequential trigger mode, sequentially starts the work of each module by reasonably distributing working time sequences, reduces the instantaneous working current of the system, and efficiently finishes the collection work of all modules in a short enough time window, so that the whole detection system has high collection efficiency, low power consumption and good safety.
In the embodiments provided in the present invention, it should be understood that the disclosed related devices and methods can be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
It will be understood by those skilled in the art that all or part of the processes in the methods of the embodiments described above may be implemented by hardware related to instructions of a computer program, and the program may be stored in a computer readable storage medium, for example, in the storage medium of a computer system, and executed by at least one processor in the computer system, so as to implement the processes of the embodiments including the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A dynamic magnetic detection system, comprising:
a magnetic field applying device for applying a bias magnetic field to the ferromagnetic substance to be measured;
the dynamic magnetic excitation device is used for generating a transient excitation magnetic field;
the magnetic field detection device is used for detecting an induced magnetic signal generated by a transient excitation magnetic field around an object to be detected;
the dynamic magnetic detection system also comprises a high-frequency pulse current generating device which is electrically connected with the dynamic magnetic excitation device;
the high-frequency pulse current generating device comprises a metal oxide semiconductor field effect transistor and a pulse current generating circuit, wherein the pulse width of the pulse excitation current is 1-5 mu s, and the rising edge and the falling edge of the pulse excitation current are 0.05-0.2 mu s respectively; the switch of the metal oxide semiconductor field effect transistor is controlled by a program in real time, and the magnetic field detection device detects the magnetic field at the falling edge of the pulse current generated by the high-frequency pulse current generation device;
the dynamic magnetic detection system further comprises:
the Hilbert transformer is connected with the magnetic field detection device and is used for performing Hilbert transformation on the magnetic signal;
the dynamic magnetic detection system further comprises:
a first low noise amplifier provided between the Hilbert transformer and the magnetic field detection device;
the second low-noise amplifier is connected to the signal output end of the Hilbert converter;
a low pass filter disposed between the Hilbert transformer and the second low noise amplifier.
2. The dynamic magnetic detection system of claim 1, wherein the dynamic magnetic excitation means comprises a dynamic magnetic excitation coil disposed in a bias magnetic field environment;
the magnetic field applying means comprises a permanent magnet or an electromagnet.
3. The dynamic magnetic sensing system of claim 1, wherein the magnetic field sensing device comprises a receiving coil, the receiving coil is a differential receiving coil, the differential receiving coil comprises a first receiving coil and a second receiving coil, the first receiving coil and the second receiving coil are wound in opposite directions, and the first receiving coil and the second receiving coil are connected end to end.
4. The dynamic magnetic detection system of claim 1, further comprising a magnetic leakage detection device, wherein the magnetic leakage detection device is a multi-channel hall chip array, and each channel comprises X, Y, Z hall chips with three perpendicular directions for detecting spatial magnetic leakage signals.
5. The dynamic magnetic detection system of claim 4, further comprising: and a control device for controlling the magnetic field applying device, the moving magnetic excitation device, the magnetic field detecting device, the magnetic flux leakage detecting device, and the Hilbert transformer.
6. A dynamic magnetic detection method applied to the dynamic magnetic detection system according to any one of claims 1 to 5, wherein the method comprises the following steps: applying a magnetic field to an object to be detected to enable the object to be detected to enter a magnetic saturation state;
applying a transient excitation magnetic field to the object to be tested;
after the transient excitation magnetic field is superposed, detecting magnetic signals around the object to be detected;
the transient excitation magnetic field is generated by a moving magnetic excitation device, is connected with the moving magnetic excitation device by a high-frequency pulse current generating device, and is input with pulse excitation current with the pulse width of only 1-5 mus and the rising edge and the falling edge of 0.05-0.2 mus respectively to generate the transient excitation magnetic field;
the high-frequency pulse current generating device comprises a metal oxide semiconductor field effect transistor;
the switch of the metal oxide semiconductor field effect transistor is controlled by a program in real time, and a high-frequency transient response magnetic signal around the object to be detected is detected at the falling edge of the pulse current generated by the high-frequency pulse current generating device; after the transient excitation magnetic field is superposed, the step of detecting the magnetic signal around the object to be detected further includes: performing Hilbert transform on the magnetic signal through a Hilbert transformer and outputting a waveform signal with dynamic magnetic response characteristics;
and judging whether the object to be detected has defects or not according to the waveform signal.
7. The dynamic magnetic detection method of claim 6, further comprising: the leakage magnetic field signal of the object to be detected in the three-dimensional space is acquired through the leakage magnetic detection device, and the switch of the leakage magnetic detection device is controlled by the control device of the dynamic magnetic detection system in real time.
8. The dynamic magnetic detection method of claim 7, further comprising: and analyzing the leakage magnetic field signal of the object to be detected in the three-dimensional space and the waveform signal of the dynamic magnetic response characteristic to acquire the defect condition.
9. An electromagnetic array control method, comprising:
providing a plurality of dynamic magnetic detection systems according to any of claims 1 to 5;
and controlling the dynamic magnetic detection system by a control system and a sequential control method through a sequential control array.
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| CN111307933A (en) * | 2020-04-15 | 2020-06-19 | 新兴铸管股份有限公司 | Nondestructive testing method for cast steel pipe |
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